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A puppy that was caught near the site of four fatal maulings sits inside a cage at a city dog pound in Mexico City,Wednesday, Jan. 9, 2013. Authorities have captured dozens of dogs near the scene of the attacks in the capital's poor Iztapalapa district, but rather than calm residents, photos of the forlorn dogs brought a wave of sympathy for the animals, doubts about their involvement in the killings and debate about government handling of the stray dog problem. (AP Photo/Dario Lopez-Mills)

Police fan out as they search for stray dogs in a park on the hilltop borough of Iztapalapa in southeast Mexico City. Tuesday, Jan. 8, 2013. The fatal mauling of four people by feral dogs in a Mexico City park set off debate Tuesday about the city's love/hate relationship with its dog population, and the guilt or innocence of 25 dogs trapped near the scene of the nightmarish killings. (AP Photo/Eduardo Verdugo)

A makeshift altar is seen at the site where the bodies of Shumashi Mendoza and her daughter were found at a park on the hilltop borough of Iztapalapa, Mexico City, Tuesday, Jan. 8, 2013. The fatal mauling of four people by feral dogs in a Mexico City park set off debate Tuesday about the city's love/hate relationship with its dog population, and the guilt or innocence of 25 animals trapped near the scene of the nightmarish killings. (AP Photo/Eduardo Verdugo)

Enrique Martinez shows a photograph of his brother Samuel, who according to authorities was killed by feral dogs on Saturday, during an interview at his home in Iztapalapa, Mexico City. Tuesday, Jan. 8, 2013. The fatal mauling of four people by feral dogs in a Mexico City park set off debate Tuesday about the city's love/hate relationship with its dog population, and the guilt or innocence of 25 animals trapped near the scene of the nightmarish killings. (AP Photo/Eduardo Verdugo)

A poster with an image of a dog reads in Spanish; "Feed the stray dogs, help them so they do not die. God will reward you!," on a wall in the hilltop borough of Iztapalapa in southeast Mexico City, Tuesday, Jan. 8, 2013. The fatal mauling of four people by feral dogs in a Mexico City park set off debate Tuesday about the city's love/hate relationship with its dog population, and the guilt or innocence of 25 dogs trapped near the scene of the nightmarish killings. Antemio Maya, president of the Street Dog Protection association, estimates for the overall number of dogs in the city of nearly 9 million people range from 1.2 million to 3 million animals. (AP Photo/Eduardo Verdugo)

Police officers take notes in front of cages where dogs caught near the site of four fatal maulings are being held at a city dog pound in Mexico City, Wednesday, Jan. 9, 2013. Authorities have captured dozens of dogs near the scene of the attacks in the capital's poor Iztapalapa district, but rather than calm residents, photos of the forlorn dogs brought a wave of sympathy for the animals, doubts about their involvement in the killings and debate about government handling of the stray dog problem. (AP Photo/Dario Lopez-Mills)

One of the dogs that was caught near the site of four fatal maulings sits inside a cage at a city dog pound in Mexico City,Wednesday, Jan. 9, 2013. Authorities have captured dozens of dogs near the scene of the attacks in the capital's poor Iztapalapa district, but rather than calm residents, photos of the forlorn dogs brought a wave of sympathy for the animals, doubts about their involvement in the killings and debate about government handling of the stray dog problem. (AP Photo/Dario Lopez-Mills)

One of the dogs that was caught near the site of four fatal maulings sits inside a cage at a city dog pound in Mexico City,Wednesday, Jan. 9, 2013. Authorities have captured dozens of dogs near the scene of the attacks in the capital's poor Iztapalapa district, but rather than calm residents, photos of the forlorn dogs brought a wave of sympathy for the animals, doubts about their involvement in the killings and debate about government handling of the stray dog problem. (AP Photo/Dario Lopez-Mills)

One of the dogs that was caught near the site of four fatal maulings rests inside a cage at a city dog pound in Mexico City, Wednesday, Jan. 9, 2013. Authorities have captured dozens of dogs near the scene of the attacks in the capital's poor Iztapalapa district, but rather than calm residents, photos of the forlorn dogs brought a wave of sympathy for the animals, doubts about their involvement in the killings and debate about government handling of the stray dog problem. (AP Photo/Dario Lopez-Mills)

One of the dogs that was caught near the site of four fatal maulings sits inside a cage at a city dog pound in Mexico City, Wednesday, Jan. 9, 2013. Authorities have captured dozens of dogs near the scene of the attacks in the capital's poor Iztapalapa district, but rather than calm residents, photos of the forlorn dogs brought a wave of sympathy for the animals, doubts about their involvement in the killings and debate about government handling of the stray dog problem. (AP Photo/Dario Lopez-Mills)

One of the dogs that was caught near the site of four fatal maulings sits inside a cage at a city dog pound in Mexico City,Wednesday, Jan. 9, 2013. Authorities have captured dozens of dogs near the scene of the attacks in the capital's poor Iztapalapa district, but rather than calm residents, photos of the forlorn dogs brought a wave of sympathy for the animals, doubts about their involvement in the killings and debate about government handling of the stray dog problem. (AP Photo/Dario Lopez-Mills)

Posters of missing dogs blanket a wall at the animal shelter in the hilltop borough of Iztapalapa in southeast Mexico City, Tuesday, Jan. 8, 2013. The fatal mauling of four people by feral dogs in a Mexico City park set off debate Tuesday about the city's love/hate relationship with its dog population, and the guilt or innocence of 25 dogs trapped near the scene of the nightmarish killings. Liliana Hernandez, a self-described street dog rights activist who lives near the park, says many people let their dogs out during the day because their cinderblock homes are too small to keep them inside. Resident of their neighborhood started running frantically to collect their dogs when police began seizing strays Monday night, she said. A veterinarian at the Iztapalapa animal shelter said it appeared that at least one of the 25 captured dogs had been a pet. (AP Photo/Eduardo Verdugo)

Police officers patrol a makeshift altar past at the site where the bodies of Shumashi Mendoza and her daughter were found at a park on the hilltop borough of Iztapalapa, Mexico City, Tuesday, Jan. 8, 2013. The fatal mauling of four people by feral dogs in a Mexico City park set off debate Tuesday about the city's love/hate relationship with its dog population, and the guilt or innocence of 25 animals trapped near the scene of the nightmarish killings. (AP Photo/Eduardo Verdugo)

A policeman practices lassoing in anticipation of roping a stray dog, as he and fellow officers search for strays in a park on the hilltop borough of Iztapalapa in southeast Mexico City. Tuesday, Jan. 8, 2013. The fatal mauling of four people by feral dogs in a Mexico City park set off debate Tuesday about the city's love/hate relationship with its dog population, and the guilt or innocence of 25 dogs trapped near the scene of the nightmarish killings. (AP Photo/Eduardo Verdugo)

A stray dog stands still in a park on the hilltop borough of Iztapalapa in southeast Mexico City, Tuesday, Jan. 8, 2013. The fatal mauling of four people by feral dogs in a Mexico City park set off debate Tuesday about the city's love/hate relationship with its dog population, and the guilt or innocence of 25 dogs trapped near the scene of the nightmarish killings. Antemio Maya, president of the Street Dog Protection association, estimates for the overall number of dogs in the city of nearly 9 million people range from 1.2 million to 3 million animals. (AP Photo/Eduardo Verdugo)

Photos: Four fatally mauled by feral dogs in Mexico City

Authorities have captured dozens of dogs near the scene of a fatal mauling of four people by feral dogs in Mexico City's poor Iztapalapa district, which happened on Saturday, Jan. 5, 2013. Rather than calm residents, photos of the forlorn dogs brought a wave of sympathy for the animals, doubts about their involvement in the killings and debate about government handling of the stray dog problem.